Plaster-gun apparatus



May 11 1926.

J. F'. JOHN SON PLASTER GUN APPARATUS Fiied June 10, 1925 5 Sheets-Sheet 1 Ma 11 1926. v

J.F. JOHNSON PLAS TER GUN APPARATUS Filed June 10 1928 5 She ets-Sheet 2 May 11 1926.

J. F. JOHNSON' PLASTER GUN APPARATUS Filed June 10, 1925 5 Sheets-Sheet 5 INVENTOR 1 J. F. JOHNSON PLASTER GUN APPARATUS May 11 1926.

' Filed June 10, 1 925 SSheets-Sheet- 4 um mm INVENTOR May 11 1926.

J. F. JO HNS ON PLASTER GUN APPARATUS Filed June 10, 1925 5 Sheets-Sheet 5 Jy. V 82:.

I Qooao 6 ocean oeoo Patented May 11,

UNITED STATES zomwr. JOHNSON, or nnnnnvun, rn numvanm, nssrcxoa 'ro rrrrssuaarr rm'rn emss cqnrm,1 coaroaa'rron'or rmmsnvanm.

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I Application filed June 10, 1925; semi no; same.

invention relates to ap aratusjor a I plying cement or plaster Paris to t e of improved apparatus of the. type men-.

tioned particularly adapted for usein thesocalled straightaway gi'mding and pohsh ng 10 operation in-which t e glass is a plied to a series of cars or, tables arrange so'as to nove miiiiuousily in he; ltirlan beniaih a seies 0 an p0 mac es. ne emlio d iment of the invention is illustrated in 15 the accompanying drawings wherein:

Figure 1 is a plan view of the general arrangement. -,Fig. 2 is a side-elevation of the general arrangement. Fig. 3 is a plan view of the air piping lay out. Fig. 4 is W a vertical section on an' enlarged scale through a portion of the a paratus. Fig. 5. is a' etail section throng the air control valve. And Fig, 6 is a detail view, partiallyin side elevation and partially in section of the hydratingor mixing nozzle and the connections thereto,

Referrin to the general Figs. 1 an arrangements of 2, 1, 2, 3, are a series of cars or tables mounted on. tracks .4 and adapted to carry sheets of glass mounted thereon beneath a series of grinding and polishing machines. 5 and 6 are a pair of plaster bins mounted above the space between the tracks, and 7 and 8 are a pair of plaster 35 containers in position to receive the plaster .z from the bins and provided with suitable air pressure means, as later described for distributing the plaster to the hydrating nozzles 9 and10 and 11 and 12 the nozzles 9.and.10 4 vbeing adapted to suppl cars or tables on Y one track'and the noz cs 11 and 12 being adapted; to supply the ears or tables on the "other tra'ck.

Each of the containers 7 and 8 is provided upon its nterior with an agitator 13 (Fig. 4)

and these agitators are rotated from the motors 14 and 15 operating through thereduc' mechanism in the casings 16 and 17. ater is supplied for the hydrating operation from the mains 18 and 19 extending longitudinally of the tracks, and air under pressure for the nozzles issupplied from t e tank 20," such tank being replenished from the pipe 21 leadingto a compressor, which is not shown.

rubber hose. Also leadi mains 18 and 19 to the its operating PATENT" OFFICE.

Leading from the lower end of the laster containers 7 and 8 are the pairs 0 pipes .212 and 23, and 24 and 25 for convey ng t e plaster from the containers to the hydratmg nozzles 9, 10, 11 and 12, such pipes being made of flexible material, such as from the water ydrating nozzles are the pipes 26, 27 28 and 29, suchpipes also being made of rubber hose, For con venience in handling, the plaster hose and water hose for each nozzle are preferably secured together throughout the major portion of their length by any suitable means, andto keep them out of the'way, they are looped to supporting trolleys 30, 31,32 and 33 mounted upon-the trolle rails 34 and 35 eirtendin lo 'tudinally o the tracks. Extending oiigit'udinally of the tracks adjacent the trolley rails 34 and 35 are a pair of air lines 36 and 37 supplied from the air tank 20 through the pipe'3 8. The flow of air from these ipes to the containers 7 and 8 is controlled i valves 39, 40, 41, etc., as more fully described later, whereb the operator of the hydrating nozzle is a Is to operate a valve at any point along the track by moving only a short distance.

The arrangement of the apparatus for supplying the cars on the two tracks is the same throughout,-and' this is also true. with side, such as for instance, the nozzles.9 and 10., so that only one of these nozzles and mechanism and connections will be described, the one selected being the nozzle 10. The nozzle 10 comprisesa-tube' fitting into the casting 42 (Fig, 6) and suitably packed, as indicated at 43. This castin 42 -is connected to the plaster 'pi 23 and water pipe 27 by means of the and 45, the flow through the water pi e 27 being controlledby means. of the glo ttings 44 valve 46, while the flow through the plaster I pipe is controlled from the valves 39, 40

and 41 as later described. The nozzle tube is perforated, as indicated at 47, so that when laster is being carried under air pressure t rough the nozzle and water is flowing throu h the pipe 27, a mixture of the .ited upon the surface of one of the grin 'ng' tables, the operator manipulating the noz:

' plaster an water occurs inside of the nozzle 4 and such mixture 1s carried out and de ossure zle' so as to distribute an even film of the mixture over the surface of the table preliminary tothe laying of a sheet of glass. The connections between the plaster, pipe 23 and the container 7 from which it is supplied will be seen by reference to Fig. 4. This pipe is connected to the valve casing 48 which in turn is connected to the pocket 49 at the bottom of the container. This 1pocket is supplied with air under presom the pipe 50, and a flow of air into the pocket from this pipe 50 carries the plaster into the pipe 23 and through such pipe to the nozzle 10. The pocket 49 is fed with plaster from the container 7 by means of the rotating feeder 51 connected to the shaft 52 which also carries the agitator 13 heretofore referred to. This shaft is journaled in the bottom of the container and packedby means of the stufling box 53. The shaft is driven from the shaft 54 by means of the gears 55 and 56, the shaft 54 being driven from the motor 14 through the intermediary of the gearing in the casing 16. Air under pressure is supplied to the top of the casing through the pipe 57, and a'closure is provided in the form. of a bell 58 mounted upon the arm 59 which is in turncarried by the shaft 60.

Extending through the casing 48 is a rubber tube 61' constituting a spincter valve which may be closed by supplying air pressure through the pipe 62. Air is also continuously supplied to the plaster pipe 23 through a by-pass pipe 63 (Figs. 3 and 4.), so that when the tube 61 is closed, there is a continuous flow through the plaster pipe so that it is cleaned out and danger of clogging between operations is avoided. One of the series of. valves 39,40, 41, etc. is shown in Fig. 5, such valvebeing arranged to controlj the flow of air through the pipes 50 and 23, the arrangement being such that when the flow of air to the pipe 50 is cut off, the casin 48 is supplied with air pressure closing t e tube 61, and when the flow of air through the pipe 50 is again applied, the flow through the pipe 62 is cut. off, and it is vented to the atmosphere so that the tube 61 is at this time open. In Fig. 5; the plugv member 64 of the valve 39 is in position permitting the flow of air from the air line 36 to the pipe 50 so that there is a flow of air through the pocket 49 (Fig. 4) and the plaster tube 23 so that the nozzle 10 is supplied with plaster, the valve' 46 being at the same time open so that a mixture of water and plaster flows through the nozzle to the table. At this time, the end .of the ipe 62 leading from the spincter casing is rought into connection with a vent assage 65 leading to the atmosphere, so t at the spincter tube 61 is free to open and permit a flow of plaster therethrough. The valve plug 64 is operated by a wheel "66 provided it registers with the ends of the pipes36 and 62.- This movement cuts-oifthe supply of air pressure to the pipe 50 and causes an application of air pressure to the interior of the casing 48, which carries the spincter tube 61, thus closing this valve and cutting off any flow of material therethrough, which might otherwise occur because of the application of pressure'to the container from the pipe 57. (lo-incident with the operation of the plug 64 to cut off the flow of air to the nozzle, the water valve 46 is operated to cut off the sup 1y of water. The air connections from t e series of valves 39, 40, 41 will be seen by reference to Fig; 3, the set of connections for each valve being similar to that as above described in connection with the valve 39. The application of air pressure to the container above the plaster and also to the lower portion through the pocket 49 insures a uniform feed of plaster to the nozzles. The air above the plaster compacts it and prevents the formation of voids in the bottom portion of the container so that the pocket 49 is more reliably suppled with plaster than it would be if no air pressure were applied above the plaster. tator 13 prevents any caking of the plaster which might interfere with the uniformity.

sure, a plaster container, a hydrating nozzle,

and flexible plaster and water pipes leading from said container and source ofwater supply respectively to said nozzle; an air line extending along the track and having aconnection with said source of air supply,

a valve in the plaster pipe having air operated closure means, a pair of connections from said air line, the first of; which leads to and operates said closure means, and the second of which leads to said container at the inlet end of the plaster pipe, and a valve arranged to control the flow of air from said air line to the pair of connections, such valve in one position permitting a flow of air through the first connection .and cutting oil the supply to the second one, and in its other position permitting a flow of air .through the second connection and cuttin off the supply to thefirst-one.

2. In combination in apparatus for applying a mixture of plaster and water to the tops of a series of grinding{ tables mounted for movement along a tree The agi-' 1 and having a source of water supply, a source of air pressure, a plaster container, a'hydrating nozzle, and flexible plaster and water pipes leading from said container and source of water supply respectively to said nozzle; an air line extending along the track and having a connection with said source of air supply, a valve in the plaster pi e having air operated closure means, a p urality of pairs of 19 connections from said air line, the first connection of each pair leading to said air operated closure means, and the second connection of each pair leading to-the container at the inlet end of the plaster pipe, and a valve for each pair of said connections, such valve in one position permitting a flow of air through the first connection, and cutting off the supply to the secondone, and in its other position permitting a flow of air through the second connection, and cutting oil the supply to the first one, said valves being arranged in series along said track.

In testimony whereof, I have hereunto subscribed my name this 2nd day of June,

JOHN F. JOHNSON. 

